This invention relates to the field of battery technology, and discloses a cold heading process for a negative
electrode post, a negative
electrode post, a battery top cover, and a battery. The cold heading process for the negative
electrode post specifically includes: blanking:
cutting a
copper-aluminum
composite plate into blanks according to a preset size; screening: screening out blanks that meet the requirements; and heading: feeding the screened qualified blanks into a first cold heading mold for
extrusion, thereby extruding a first groove on the top of the aluminum layer to increase the height of the aluminum layer. By cold heading the blanks to form the negative electrode post,
welding and CNC
machining processes are eliminated, improving production efficiency and saving costs. It also ensures a strong bond between the
copper and aluminum
layers, reducing the risk of breakage and improving the reliability of the negative electrode post.